1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py

index 3e77fd3901..75ac06da85 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -675,7 +675,7 @@ class RoomMemberStore(SQLBaseStore):
 
         defer.returnValue(result)
 
-    @cached(max_entries=10000, iterable=True)
+    @cached(max_entries=10000)
     def _get_joined_hosts_cache(self, room_id):
         return _JoinedHostsCache(self, room_id)